Benefit Plans - Non-Qualified Retirement Plans (Details) - Pension Plan, Defined Benefit, Non-qualified $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Non-Qualified Retirement Plans [Abstract]
Expected employer contributions in next fiscal year	$ 6.0
Future expected benefit payments, 2017	6.0
Future expected benefit payments, 2018	7.3
Future expected benefit payments, 2019	5.8
Future expected benefit payments, 2020	6.2
Future expected benefit payments, 2021	6.0
Future expected benefit payments, 2022 through 2026	$ 27.8
Minimum
Non-Qualified Retirement Plans [Abstract]
Non-qualified retirement plan, number of years of highest average annual compensation used to determine benefits	5 years
Maximum
Non-Qualified Retirement Plans [Abstract]
Non-qualified retirement plan, number of years of highest average annual compensation used to determine benefits	10 years

Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Defined Benefit Plan, Number of Years of Highest Average Annual Compensation Used to Determine Benefits

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- Definition

Non-qualified Retirement Plans [Abstract]

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